Battery charger



FIG. 1 is a perspective view of a battery charger showing my new design;

The broken line showing of the battery is included for the purpose of illustrating environmental structure only and forms no part of the claimed design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a back elevational view thereof;

FIG. 6 is a right side elevational view thereof, shown minus the cord for purpose of clarity; and,

FIG. 7 is a left side elevational view thereof. 

The ornamental design for a battery charger, as shown and described. 